package com.gaga.metadata.query;


import com.gaga.metadata.constant.SqlServerConstant;

import java.sql.ResultSet;
import java.sql.SQLException;

/**
 * 主要封装不同数据库语句不同的适配
 *
 * @author liujia
 * @version 1.0
 * @date 2022/5/23 15:31
 */
public class SqlServerQuery extends AbstractDBQuery {

    @Override
    public String schemaAllSql() {
        return SqlServerConstant.QUERY_SCHEMA_SQL;
    }

    @Override
    public String tablesSql(String schemaName, String tableName) {
        return String.format(SqlServerConstant.QUERY_TABLE_BY_SCHEMA_SQL, schemaName);
    }

    @Override
    public String columnsSql(String schemaName, String tableName) {
        return String.format(SqlServerConstant.QUERY_COLUMNS_SQL, tableName);
    }

    @Override
    public String schemaName() {
        return "TABLE_SCHEMA";
    }

    @Override
    public String tableName() {
        return "TABLE_NAME";
    }

    @Override
    public String tableType() {
        return "TYPE";
    }

    @Override
    public String tableComment() {
        return "COMMENTS";
    }

    @Override
    public String rows() {
        return "rows";
    }

    @Override
    public String columnName() {
        return "COLUMN_NAME";
    }

    @Override
    public String columnType() {
        return "DATA_TYPE";
    }

    @Override
    public String columnComment() {
        return "COMMENTS";
    }

    @Override
    public String columnKey() {
        return "KEY";
    }

    public boolean isKeyIdentity(ResultSet results) throws SQLException {
        return 1 == results.getInt("isIdentity");
    }

    @Override
    public String isNullable() {
        return "NULLVALUE";
    }

    @Override
    public String limit(Integer pageNum, Integer pageSize) {
        return "limit " + pageSize + " offset " + (pageNum - 1) * pageSize;
    }
}
